<nav class="navbar navbar-light bg-light">
  <div class="container-fluid">
    <a class="navbar-brand">锋企网站管理系统</a>
    <div>
      <img
        src=""
        alt=""
        id="topbar-photo"
        style="width: 40px; height: 40px; border-radius: 50%"
      />
      <span id="currentUsername">Admin</span>
      <button type="button" class="btn btn-danger" id="exit">退出</button>
    </div>
  </div>
</nav>
